Todd, 51, suffered serious injuries after the incident near Petersville, Alaska on Sunday. His father, Jim, told the Today show on Tuesday that his son "hit a stump or something that knocked him out of kilter."

"Todd Palin is in intensive care at an Alaskan hospital with injuries including multiple broken and fractured ribs, broken shoulder blade, broken clavicle, knee/leg injuries; and a collapsed lung," she wrote on Facebook on Tuesday morning. "He is presently back in surgery to repair multiple fractures."

She called him her family's "rock" and "the toughest guy I know," and thanked supporters for their prayers.

"Knowing Todd, once he's cognizant, he'll probably ask docs to duct tape him up and he'll call it good. He's tough," she wrote Tuesday.

She then canceled the rest of her appearances to fly back to Alaska to see Todd, according to the Trump campaign.

A statement issued through the campaign said: "Todd Palin was in a bad snow machine accident last night and is currently hospitalized. Gov. Palin is returning to Alaska to be with her husband."

Todd is an avid snowmobile racer and just took part in the Iron Dog, a grueling 2,000-mile snowmobile race across Alaska. When INSIDE EDITION visited the family's home in Wasilla in 2014, Todd Palin showed off his prized snowmobiles.